I notice Hornet II fall from sky like a brick!

[Super-Hornet]

Hi all

I notice that Hornet II really fall pretty fast down to ground. I go a crash with loud bang today (Only 1 feet up).

I then do something different from usual setup. I make my pitch curve with such a way at 0 throttle, my pitch is AT MAX! The reason to do so is like those fixed pitch Heli or doing such a way like AutoRotation. That will soften up the impact. So, those of u with AutoRototion might like this idea also but if u have AutoRotation, u might not want to go MAX +ve AoA.

Super-Hornet

[D.Yeo]

Hmmmm i was thinking maybe your head speed is damn high and your pitch curve is too steep ? makes it drop damn fast ?

It's damn scary stuff haha and also when braking and coming in from flying at speed or stopping after turns the heli will lose altitude really fast too.

I think it's more us being used to a floaty feda than the hronet being a divey heli.

I actually have negative pitch at the lower points of my throttle. Full pitch at zero power sounds to me like throwing away a hundred bucks on repairs

if you put full pitch when the blades aren't being driven i think you'll stall them rather than have them autorotate nicely and in a stylish manner.

[ammo]

Whatever you know, maintain your headspeed in the safe zone, a collective pitch heli just doesn't work the same way as a fixed pitch and don't even think of trying that.

of cos unless you have a backup heli

[Brandon Chng]

eh, isn't it easier to just apply throttle when its near the ground? having full pitch will never get the heli to land soft. so much headspeed will be bled off that the blades would stall and not produce any lift. this is at least what i know the nitro guys do. in normal mode, we have -3deg pitch at low throttle. when we descend, just add throttle at the bottom. as what i learnt from a fuse and arthur, must have a little negative at the bottom, or else when wind comes, or when you are in forward flight, there will be so much translational lift that without negative pitch, the heli will never descend. as for throttle hold mode, according to my raptor manual, its bottom pitch is almost all the way down as it can go...

[HZM]

Yeah u don want to be caught in a situation where yr heli refuse to come down and keep floating away

Mike

[BonJour Brat]

I make my pitch curve with such a way at 0 throttle, my pitch is AT MAX!

That explains why ur heli falls from the sky!

[Super-Hornet]

Hi all

OK... Initially my Pitch Curve is such a way at Max Power, there is a small +AoA. At 0 Throttle, the Pitch is at 0 AoA. Yeah... My RPM is high. That is why my pitch changes is small.

I don't know about u all but for me, I using Himax motor. It is a inrunner. In my motor, when motor is off, It spin very smoothly. With that, my main blades can rotate just like those having One-Way gear. With that, when I power down my chopper, the main blades can spin freely. I can land smooth down with no problem. It just that in some situtation that I need to put the bird down quick. When I do sudden power off, my blades AoA is at 0 pitch. With that, it falls like a brick. I then tries creating some +AoA only at 0 Throttle, then I tried do sudden power down, It still hit to the ground but with softer landing. It even bounce around also.

I agree that at strong wind, I might encounter problem of landing but I haven't proove it.

Super-Hornet

[Super-Hornet]

Oh... One more thing. In my Futaba 9CH, i set the 5 point curve in such a way the last value is at max +AoA. The rest of the curve remain as per normal. I notice that When throttle at 0, the pitch is at some +AoA (Only like 3 to 4 Degree). When the motor start spinning, the AoA is at 0. As the motor spin faster and faster, the pitch is getting more and more +AoA (Note: Max +AoA is only a few degree). So, the sudden +AoA during motor off should not cause any problem.

Super-Hornet

[Art]

Brandon...eh...who say the bottom is max low when you autorotate har?

for me....

Normal...

-5
0
+6
8
10

Idle up

-10
-6
0
+6
10


Throttle hold

-5
0
+6
8
12

there should not be -9 or -10 situations for throttle hold....

Nor should there be +10 at min throttle....

try a 40 reading at pt 2 of the throttle curve....

My throtte curve at normal mode is

0
40
50
75
100

...so when I descend it powered till I cut all the way...hence my bottom is...-5...0 throttle...

and the important part is...pt 2

0 degree
40 throttle....powered descend...gives me the control over the bird....

having max +9 or +10 at the bottom will kill the headspeed....suppose you wanna pull out of an accidental power down...the bird will do a sudden jerk...kill the headspeed...and you'll need to spool up again to pull out...all in a matter of 1 second.....dun think any motor or engine can do that.....

Super-hornet...you may wanna revert back to the 'conventional way'???

[Brandon Chng]

art, how exactly do you fine tune the curves? like...follow a set setting, then from there how to know whether its correct?

[Art]

it's simple actually...no secrets....


JUST BURN NITRO>.....

[Art]

ok ok...on a more serious note...your raptor manuel's got a set of guidelines....

use them...and when you feel the bird not to your touch./..tune as needed...it's more of a feeling than anything else....feel the bird...compare how yours is to what you see in videos...and at the field..then tune accordingly.....

but of course you gotta learn how to circuit and do some hard flying first...then you'll know if the bird can perform...

[D.Yeo]

haha hey bon i like your reply !

Originally posted by Super-Hornet
Oh... One more thing. In my Futaba 9CH, i set the 5 point curve in such a way the last value is at max +AoA. The rest of the curve remain as per normal. I notice that When throttle at 0, the pitch is at some +AoA (Only like 3 to 4 Degree).

Super-Hornet

another thing hornet , it might be nice sounding when you say AoA and show us the right abbreviateion for it but it's something of a misnomer in this case.

i think you kind of got the terms wrong. Even angle of incidence and angle of attack are two(2) different things altogether. pitch is pitch lets leave that as that?

i'm not under the delusion that i'm qualified to ever dare go into the intricacies of the right terminology so i wont. bleh !

At anyrate everyone of us says pitch so maybe it'll be, if nothing else, more polite yeah ? besides you never know you might be confusing some of our mongolian friends yes ? haha !

[Super-Hornet]

Hi Derrick.

I think calling the positive pitch as +AoA should be all right because if u look at the blades, it is like an airplane wing. When your blades go positive pitch, u have something like positive Angle of Attack.

Super-Hornet

[Super-Hornet]

Oh.. If u get confuse of my term of AoA... Then just ignore or forget the whole thing. Just know that what I do is to have some positive pitch when motor is off and when motor start spinning, I have 0 pitch. At max throttle, my pitch is at max (Note: the amount of pitch is depend on my "Swash AFR" setting and "Pitch Curve Percentage" value.

Super-Hornet